/**
 * This file is part of Too-OneBee.
 *
 * Too-OneBee is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Too-OneBee is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Too-OneBee.  If not, see <http://www.gnu.org/licenses/>.
 */
package net.dataforte.tooonebee.script;

import static net.dataforte.tooonebee.Menu.menu;

import java.io.PrintWriter;
import java.util.Set;

import javax.script.Bindings;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import javax.script.SimpleBindings;
import javax.servlet.ServletConfig;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.dataforte.tooonebee.Menu;
import net.dataforte.tooonebee.ServiceIntrospector;

public class ScriptIntrospector extends ServiceIntrospector {
	String mimetype;
	private ScriptEngineManager scriptEngineManager;
	
	@Override
	public void init(ServletConfig config) {
		scriptEngineManager = new ScriptEngineManager();
	}

	@Override
	public String getRequestPath() {
		return "script";
	}
	
	@Override
	public Set<Menu> getMenuEntries() {
		Set<Menu> entries = super.getMenuEntries();
		entries.add(
			menu("Scripting", this.getRequestPath())
		);
		return entries;
	}

	@Override
	public void handleRequest(HttpServlet servlet, HttpServletRequest req, HttpServletResponse res) throws Exception {
		Bindings bindings = new SimpleBindings();
		PrintWriter writer = res.getWriter();
		bindings.put("out", writer);

		bindings.put("application", servlet.getServletContext());
		bindings.put("session", req.getSession());
		bindings.put("principal", req.getUserPrincipal());

		try {
			runScript(req.getParameter("script"), bindings);
		} catch (ScriptException e) {
			e.printStackTrace(writer);
		}
	}

	private void runScript(String script, Bindings bindings) throws ScriptException {
		ScriptEngine engine = scriptEngineManager.getEngineByName("javascript");
		engine.eval(script, bindings);
	}
}
